The length between the two buildings are about 500 meters. The antennas are connected to a pole on the roof. We needed long antenna cables to connect the antennas from the roof to the access points inside the building behind the fire-resisting wall. Keep in mind that the longer antenna cables you use, the more they reduce the signal strength. You can play with the “antenna gain” value inside the Dot11Radio interface. With external antenna you have a gain substracted with the long antenna cable value.

I had very big problems to bring the wireless bridge online. After the remote AP has connected, the device crashed, writes a crash log into the flash and restarts. I got the following messages:

Installed software was ap3g2-k9w7-mx.152-2.JA. Then I decided to update both autonomous IOS images. I downloaded ap3g2-k9w7-tar.152-4.JB6.tar and erased the whole flash on the system. Don’t forget to save the config with “wr mem” after this. After this you can download and extract directly to the flash with

archive download-sw tftp://10.20.30.5/ap3g2-k9w7-tar.152-4.JB6.tar

After the reload I could successfully connect both access points. Here is my configuration: